Plum tree named ‘Suplum60’

ABSTRACT

A new and distinct variety of plum tree,  Prunus salicina , cv. ‘Suplum60’ is characterized by having fruit that is very large, with black skin and red flesh that ripens late in the season. The fruit of the new variety ‘Suplum60’ also has firm flesh, a mildly sweet flavor and a stone that is adherent to the flesh.

Latin name of the genus and species claimed: Prunus salicina.

Variety denomination: ‘SUPLUM60’.

BACKGROUND AND SUMMARY OF THE INVENTION

This application relates to the discovery and asexual propagation of a new and distinct variety of plum tree, Prunus salicina cv. ‘Suplum60’. The new variety was first originated near Wasco, in Kern County, Calif. by hybridization and identified in September 2016 by Terry A. Bacon and Terrence J. Frett as breeder number ‘PL1964RB’.

The seed parent is ‘97P040-010-244’ (unpatented breeding selection), and the pollen parent is unknown (from a bulk pollen of unpatented breeding program selections). The parent varieties were first crossed in March 2013, the date of first sowing being March 2014 and the date of first flowering being March 2016. The new plum variety ‘Suplum60’ was first asexually propagated by Terry A. Bacon and Terrence J. Frett near Wasco, Kern County, Calif. in February 2017 by dormant grafting.

The new variety ‘Suplum60’ is characterized by having fruit that is very large, with black skin and red flesh that ripens late in the season. The fruit of the new variety ‘Suplum60’ also has firm flesh, a mildly sweet flavor and a stone that is adherent to the flesh.

The new variety ‘Suplum60’ resembles its seed parent ‘97P040-010-244’ (unpatented breeding selection) in that both have fruit with black skin and red flesh. However, flowering time starts 5 days earlier for the new variety ‘Suplum60’ and the fruit of the new variety ‘Suplum60’ begins ripening about 51 days later than the fruit of ‘97P040-010-244’. Further, the new variety ‘Suplum60’ also has a larger fruit weight of about 176 g compared to a fruit weight of about 127 g for ‘97P040-010-244’.

The new variety ‘Suplum60’ ripens late in the season like ‘Suplumsix’ (Plant Pat. No. 2,747), but the fruit of the new variety ‘Suplum60’ begins ripening about 6 days later, on September 8 compared to September 2 for ‘Suplumsix’. Further, the fruit of the new variety ‘Suplum60’ has a red flesh compared to the yellow flesh of ‘Suplumsix’ and a larger size fruit at about 176 g compared to about 124 g for ‘Suplumsix’. Additionally, the new variety has a brix of 18% and a Brix:Acid ratio of about 28 compared to a brix of 16% and Brix:Acid ratio of about 40 for ‘Suplumsix’.

The new variety ‘Suplum60’ has red flesh like ‘Suplumeleven’ (Plant Pat. No. 4,902), ‘Suplumfiftyone’ (Plant Pat. No. 29,846) and ‘Suplumfifty’ (Plant Pat. No. 27,327) but the new variety ‘Suplum60’ ripening starts about September 8 compared to July 2 for ‘Suplumeleven’, July 25 for ‘Suplumfiftyone’ and August 10 for ‘Suplumfifty’. Additionally, the size of the fruit of the new variety ‘Suplum60’ is larger, at about 176 g, compared to 145 g for ‘Suplumeleven’ and 170 g for ‘Suplumfiftyone’, but is smaller than the fruit of ‘Suplumfifty’, which is about 195 g.

The new variety ‘Suplum60’ has been shown to maintain its distinguishing characteristics through successive asexual propagations by, for example, cuttings and grafting.

BRIEF DESCRIPTION OF THE PHOTOGRAPH

The accompanying color photographic illustration shows a typical three-year-old specimen of the foliage and fruit of the plum variety ‘Suplum60’. The illustration shows the upper and lower surfaces of the leaves and exterior and sectional views of the fruit. The photographic illustration was taken shortly after the fruit was picked and the colors are as nearly true as is reasonably possible in a color representation of this type.

DETAILED DESCRIPTION

Throughout this specification, color names beginning with a small letter signify that the name of that color as used in common speech is aptly descriptive. Color names beginning with a capital letter designate values based upon The R.H.S. Colour Chart published by the Royal Horticultural Society, London, England, 1986.

The descriptive matter which follows pertains to three-year-old ‘Suplum60’ plants grown in the vicinity of Wasco, Kern County, Calif. during 2020 and is believed to apply to plants of the variety grown under similar conditions of soil and climate elsewhere.

TREE

-   General: (Measurements taken on three-year-old trees unless     otherwise noted).     -   -   Size.—Medium: reaches a height of approximately 3 meters             with normal pruning.         -   Habit.—Spreading.         -   Width.—Approximately 3 m.         -   Vigor.—Medium. Top shoot growth of 1 meter during the             growing season.         -   Productivity.—Very productive.         -   Bearer.—On spurs and long shoots.         -   Fertility.—Self-incompatible; requires pollinator.         -   Hardiness.—Hardy in all fruit growing areas of California.             Winter chilling requirement is approximately 700 hours at or             below 7.2° C.         -   Disease resistance/susceptibility.—Under close observation             in Kern County, Calif., no particular plant/fruit disease             resistance/susceptibility has been observed.         -   Insect resistance/susceptibility.—Under close observation in             Kern County, Calif., no particular plant/fruit insect             resistance/susceptibility has been observed. -   Trunk: (Measurements taken at approximately 30 cm above soil line on     mature tree).     -   -   Diameter.—Approximately 13 cm.         -   Texture.—Medium shaggy, increasing with age of tree.         -   Trunk color.—About Dark Greyed-Orange 166A, becoming darker             with age. -   Branches: (Measurements taken at approximately 90 cm above soil     line).     -   -   Size.—Diameter approximately 9 cm.         -   Texture.—Medium shaggy, increasing with age.         -   Color.—About Dark Grey 201B with highlights of about Medium             Grey-Brown 199B, becoming darker with age.         -   Lenticels.—Present.         -   Lenticels density.—Plentiful, about 50/cm².         -   Lenticels color.—About Medium Greyed-Green 197C.         -   Lenticels dimensions.—Length: approximately 1-3 mm. Width:             approximately 0.5 mm. -   One year old shoots: (Data taken in September at mid-point of     current-season growth).     -   -   Size.—Average diameter approximately 6 mm.         -   Topside color.—About Medium Green 137C, becoming Medium             Greyed-Orange 165B by September.         -   Underside color.—About Medium Green 137C, becoming Medium             Greyed-Orange 165B by September.         -   Internode length.—Approximately 20 mm. Midway on shoot.         -   Lenticels color.—About Medium Greyed-Green 197C.         -   Lenticels size.—Very small, difficult to see, about 0.2 mm             diameter.         -   Lenticels density.—Medium.         -   Spur length.—Medium, usually 8 mm.         -   Anthocyanin intensity on upper side of shoot.—Medium. -   Vegetative buds:     -   -   Position of vegetative bud in relation to shoot.—Slightly             held out.         -   Size.—Medium, approximately 1.7 mm wide×2.7 mm long.         -   Shape.—Ovoid.         -   Bud shape at apex.—Obtuse.         -   Color.—About Dark Greyed-Orange 166A. -   Flower buds:     -   -   Shape.—Ovoid.         -   Dimensions.—Approximately 1.1 mm wide×2 mm long.         -   Color.—About Medium Greyed-Orange 177B.         -   Distribution.—2-6 buds, generally on spurs and one-year old             shoots.         -   Ratio of flowering buds to vegetative buds.—2-6 flower buds             to 1 vegetative bud.

FOLIAGE

-   Leaves: (Data taken in July on fully expanded leaves at mid-point of     the current season growth).     -   -   Average length.—Medium; approximately 7.3 cm without             petiole.         -   Average width.—Medium; approximately 3.3 cm.         -   Length/width ratio.—Moderately elongated; about 1.8:1.         -   Shape.—Elliptic.         -   Color.—Upper surface: About Dark Green 139A. Lower surface:             About Medium Green 136C.         -   Glossiness of upper side.—Medium.         -   Angle at apex (excluding tip).—Acute.         -   Shape of base.—Acuminate.         -   Vein color.—About Light Green 139D with highlights of Medium             Greyed-Orange 176C where exposed to sun.         -   Venation.—Pinnately net veined.         -   Surface texture.—Smooth on both upper and lower surfaces.         -   Shape in the cross section.—Concave.         -   Profile.—Up folded.         -   Leaf blade tip.—Curved downwardly.         -   Undulation of margin.—Slight.         -   Density of pubescence of lower side.—Absent or very sparse.         -   Incisions of margin.—Bi-crenate. -   Petiole:     -   -   Average length.—Long; approximately 16 mm.         -   Average diameter.—Approximately 2 mm.         -   Color.—About Light Green 139D with highlights of Medium             Greyed-Orange 176C where exposed to sun. -   Stipules:     -   -   Number/Leaf bud.—Usually two.         -   Typical length.—Approximately 8 mm.         -   Color.—About Dark Greyed-Orange 166A when dried.         -   Persistence.—Falls off. -   Leaf glands:     -   -   Average number and arrangement.—2-4, alternating.             Predominately on petiole.         -   Form.—Globose.         -   Diameter.—Approximately 0.3 mm.         -   Color.—About Medium Greyed-Yellow 162A becoming Dark             Greyed-Orange 166A over time.         -   Positions of nectarines (glands).—Rarely present, but             predominately on petiole when found.

FLOWERS

-   General:     -   -   Time of beginning of flowering.—Late for the San Joaquin             Valley, Calif.         -   Flower blooming period.—First bloom: Approximately March 1             in Wasco, Calif. Full bloom: Approximately March 11 in             Wasco, Calif.         -   Location of first bloom.—Tips of one-year old shoots.         -   Location of full bloom.—Central part of the tree canopy.         -   Duration of bloom.—Approximately 10 days.         -   Flower diameter.—Medium, approximately 1.8 cm.         -   Flower form.—Showy.         -   Pollen amount.—Abundant. -   Pedicels:     -   -   Length.—Long, approximately 12 mm.         -   Diameter.—Approximately 1.2 mm.         -   Color.—About Light Green 138C.         -   Pubescence.—Absent. -   Petals:     -   -   Number.—5.         -   Arrangement.—Slightly overlapping.         -   Color.—About White 155A.         -   Length.—Medium, approximately 7.8 mm.         -   Width.—Approximately 7.9 mm.         -   Shape.—Circular.         -   Apex shape.—Rounded.         -   Base shape.—Narrows at point of attachment.         -   Surface texture.—Smooth.         -   Undulation of margins.—Medium.         -   Frequency of flowers with double petals.—None.         -   Claw.—Absent. -   Sepals:     -   -   Number.—5.         -   Length.—Approximately 4 mm.         -   Width.—Approximately 3 mm.         -   Shape.—Triangular.         -   Color.—About Light Green 138C.         -   Surface texture.—Smooth.         -   Margins.—Undulating.         -   Positioning.—Adpressed to petals.         -   Frequency of flowers with double sepals.—None. -   Stamens:     -   -   Number.—About 24-30; usually 28.         -   Average length.—Variable, ranging from 3 mm to 10 mm.         -   Filament color.—About White 155A.         -   Flower pollen color.—About Light Yellow-Orange 18A.         -   Position.—Perigynous. -   Pistil:     -   -   Average length.—Approximately 3-4 mm.         -   Ovary diameter.—Approximately 2.2 mm.         -   Pubescence.—Absent.         -   Stigma extension in comparison to anthers.—Usually below.         -   Style frequency of supplementary pistils.—Few. -   Receptical:     -   -   Depth.—Medium, approximately 4 mm.         -   Pubescence of inner surface.—Absent.         -   Pubescence of outer surface.—Absent.

FRUIT

-   General: (Description taken at firm-mature near Wasco, Kern County,     Calif.). -   Ripening:     -   -   Time of beginning of fruit ripening.—Late season.         -   Date of first pick.—Approximately September 8.         -   Date of last pick.—Approximately September 21. -   Size:     -   -   Height.—Tall, approximately 77 mm.         -   Diameter in line with suture plane.—Approximately 76 mm.         -   Diameter perpendicular to suture plane.—Broad, approximately             77 mm.         -   Average weight.—Very large, approximately 176 gm. -   Peduncle:     -   -   Length of stem.—Short; approximately 7 mm.         -   Diameter of stem.—Approximately 3 mm.         -   Color of sent.—About Light Green 139D. -   Shape:     -   -   Viewed from apex.—Circular.         -   Viewed in-line with suture.—Circular.         -   Viewed from side, perpendicular to suture.—Circular.         -   Symmetry.—Symmetric or slightly asymmetric.         -   Shape of base.—Truncated.         -   Shape of apex.—Depressed. -   Fruit stem cavity:     -   -   Depth of stalk cavity.—Shallow; Approximately 8 mm.         -   Width of stalk cavity.—Medium; Approximately 14 mm.         -   Depth of suture.—Absent or very shallow. -   Fruit skin:     -   -   Thickness.—Medium; typical of most varieties.         -   Flavor.—Mildly tart.         -   Adherence to flesh.—Strong.         -   Surface texture.—Rippled.         -   Pubescence.—None.         -   Bloom on skin.—Strong.         -   Ground color.—Not visible.         -   Overcolor.—About Dark Black 202A.         -   Relative area of overcolor.—Whole surface.         -   Pattern of overcolor.—Solid.         -   Reticulation.—Present.         -   Tendency to crack.—Rare.         -   Number of lenticels.—Few, small and difficult to see. About             10/cm².         -   Size of lenticels.—Very small, approximately 0.2 mm. -   Flesh at firm-mature harvest stage:     -   -   Ripens.—Evenly.         -   Texture.—Crisp-juicy.         -   Flavor.—Mildly sweet, medium acid, about 28 Brix:Acid.         -   Color.—About Dark Red 45A.         -   Firmness.—Firm; typically 10 lb pressure at harvest.         -   Juice.—Medium; able to squeeze free juice easily.         -   Acidity.—Medium; 0.65% titratable acidity.         -   Sweetness.—High; about 18% Brix at harvest.         -   Adherence to stone.—Adherent.         -   Amount of fiber.—Medium. -   Fruit use: Fresh market. -   Fruit shipping and keeping quality: Good. -   Stone:     -   -   Stone freeness.—Cling.         -   Stone size.—Size: Medium. Length: Approximately 26 mm.             Diameter in line with suture plan: Approximately 19 mm.             Diameter perpendicular to suture plane: Approximately 10 mm.         -   Color.—About Medium Greyed-Orange 170B when dried.         -   Position of maximum diameter.—Middle.         -   Shape from lateral view.—Medium elliptic.         -   Shape from ventral view.—Narrow elliptic.         -   Shape from basal view.—Narrow elliptic.         -   Base shape.—Nearly straight.         -   Apex shape.—Pointed.         -   Stone ridges.—Rounded throughout.         -   Stone outgrowing keel.—Partially developed.         -   Ventrical edge.—Thin with slight wing toward middle.         -   Dorsal edge.—Narrow, shallow grooves throughout.         -   Fibers.—Not visible.         -   Symmetry in lateral view.—Symmetrical or slightly             asymmetrical.         -   Texture of lateral surface.—Slightly rough.         -   Stalk-end dimensions.—Medium, approximately 10 mm wide and             20 mm long.         -   Tendency to split.—Rare. 

What is claimed is:
 1. A new and distinct variety of plum tree named ‘Suplum60’ as herein described and illustrated. 